Burner for air heaters



Jan 19, 1932. e. WUNSCH I 1,841,565

BURNER FbR AIR HEATERS Filed Nov. 25, 1929' GZcZ 0 (dd/z V I by W a omey vl 'atenlgetl Jan. 19, 1932 PATENT OFFICE GUIDO W'fiNSCH, OF BERLIN-STEGLITZ, GERMANY BURNER r03 AIR HEATERS Application filed November 25, 1929, Serial No; 409,728, and in Germany January 10, 1929.

This invention relates to a burner for use in connection with air heaters to be re-heated alternately and to be fed with air under pressure. It has already been proposed to ,5 provide air-heaters of this kind (also termed Cowpers stoves) with a combustion air suction nozzle, or blow-nozzle respectively, which is open in the direction to the atmosphere and connected with the gas supply branch in the manner of an ejector so that the energy of flow of the gas is utilized for the sucking in of the combustion air. It is also with gas burners of a similar design already known to provide a regulating mem her in the air supply pipe which is in open communication with the atmosphere, the object of that member being to vary the amount of the combustion air that is sucked in. It has, however with the known burners of the just stated kind been found that, as a rule, it is very difficult to so proportion the free sectional area of the place where the gas enters that the entire availablegas pressure can be utilized as en ergy of flow. That difficulty has been overcome by the present invention, the chief feature of which is the adjusting device of or for the suction nozzle, or of or for the blow nozzle respectively, is so designed that simultaneously with adj usting. said nozzle also the sectional area of the gas inlet aperture is varied. In a preferred embodiment of my invention in which the suction nozzle, or the blow nozzle respectively, for the combustion air is arranged within the annular sectional area through which the gas enters the object in view is attained in a particularly useful manner by making the sectional area of said nozzle adjustable so that said annular sectional area around the said nozzle can be varied and accommodated to the gas pressure available at the time being by enlarging or reducing the diameter of the nozzle mentioned. The alteration of this diameter can be effected, for instance, in that said nozzle is composed of a plurality of longitudinal members, say lamellae or the like, which overlap one another at their longitudinal rims and can in theirentirety be expanded or contracted by suitably designed and arranged members, as hereinafter more fully explained.

My invention is illustrated diagrammatically and by wayof example on theaccompany drawings on which Figure 1 is an axial section through the new arrangement and combination of parts, and Figure 2 shows the thus improved device seen in the direction from the left to the right,as regards Fig. 1, the tube 1) of Fig. 1 being omitted.

On the drawings, (1 denotes a casing which is connected with the gas supply conduit by means of the branch a and which is, besides, I

' is in open communication with the atmosphere, and to the inner edge of which is hinged a plurality of straight members (I and (Z (F igs. 1 and 2) which overlap one 7 another at their longitudinal rims and form in their entirety a hollow truncated cone which extends in the direction to the pipe 6 and terminates shortly in front thereof.

There are outer members (I and inner members al I have chosen the expression lamellae for all these members.

A vertical transverse member 9 provided in the narrow end of the branch (1 carries a horizontal pivot h extending in the direction to, and into, the hollow truncated cone formed by the lamellae, and a sleeve f shiftable upon said pivot is connected with the lamellae d by means of rods 6. The sleeve can be shifted by means of a bell-crank lever is (fu'lcrumed at the transverse member 9 on a pivot z), a connecting rod m, and a threaded spindle p having a hand wheel 1" attached thereto, this spindle and the rod m being connected with one another by an intermediate member 0 guided on a pin n. The outer lamellae d are connected with the pivot h, at the end thereof, by means of tensile springs s pressing the rims of these lamellae upon the rims of the lamellae d and preventing, thus, the forming of gaps betweenthe lamellae d and (2 In other words, the nozzle formed by all said lamellae is always closed around its circumference.

The combustion air is supplied positively by means of a propeller 20 arranged in the member 0 and driven by an electric motor if supported on a base or foot to made integral with said member c.

Now, it is obvious that the sectional area of the air nozzle formed by the lamellae can be enlarged or reduced by turning the hand wheel in the one or the other direction, the movement of the hand wheel being first transformed by the intermediate member 0 and then transmitted to'the lamellae d by means of the rod m, the bell-crank lever is,

the sleeve 7, and the rods 6, and simultaneously with any change of the sectional area at the narrow end of the nozzle 0? (Z also the annular passage around it, i. e. between it and the narrow end of the branch a is varied, that is to say, varied in the opposite sense, in that said latter sectional area is decreased when the first-mentioned sectional area is increased, and reversely.

I wish it to be understood that I do not limit myself to all details shown and described in that also equivalent arrangements and combinations of parts may be used for the purpose in view, and the same is true of such constructional forms in which the gas is supplied through the inner space and the air through the outer (the annular) space. Concerning this reversal, as well as the details of the device, various constructional forms of the same are possible and I consider all of them as lying within the scope of my invention.

I claim:

1. A burner for use in connection with airheaters to be re-heated alternately and to be fed with air under pressure, comprising, in combination, a gas supply nozzle; a combustion air nozzle, the wall of which is composed of longitudinal members overlapping one another at their longitudinal rims, and movably connected with one another at one end of this nozzle, this end being in open communication with the atmosphere; and means at the other end of said nozzle for moving said nozzle-forming members so as to increase or decrease the free sectional area of this nozzle, and to decrease or increase at the same time the free sectional area of the other nozzle.

2. A burner for use in connection with airheaters to be re-heated alternately and to be fed with air under pressure, comprising, in combination, a gas supply nozzle; a combustion air nozzle comprising, in turn, a stationary member in open communcation with the atmosphere, and a plurality of substantially plane movable longitudinal members hinged to said stationary member and overlapping one another at their longitudinal rims and forming in their entirety the main part of the air nozzle; and means for moving said movable longitudinal members Without bending them.

3. A burner for use in connection with airheaters to be re-heated alternately and to be fed with air under pressure, comprising, in combination, a gas supply nozzle; a combustion air nozzle comprising, in turn, a stationary member in open communication with the atmosphere, and a plurality of movable longitudinal members hinged to said stationary member and overlapping one another at their longitudinal rims and forming in their entirely the main part of the air nozzle; a centrally located stationary pin extending into the outlet end of the air nozzle; a sleeve shiftable upon said pin; rods connecting said sleeve with those of said longitudinal members, the rims of which lie on the outside of the other longitudinal members; and means for shifting the said sleeve.

4. A burner for use in connection with airheaters to be re-heated alternately and to be fed with air under pressure, comprising, in combination, a gas supply nozzle; a combustion air nozzle comprising, in turn, a stationary member in open communication with the atmosphere, and a plurality of movable longitudinal members hinged to saio. stationary member and overlapping one another at their longitudinal rims and forming in their entirety the main part of the air nozzle ;v a centrally located stationary pin extending into the outlet end of the air nozzle; a sleeve shiftable upon said pin; rods connecting said sleeve with those of said longitudinal members, the rims of which lie on the outside of the other longitudinal members; tensile springs connecting these other members with the said pin; and means for shifting the sleeve on the pin, substantially and for the purpose set forth.

In testimony whereof I affix mysignature.

GUIDO WUNSGH. 

